# 2023 Knoxville Challenger – Singles

Ben Shelton was the defending champion but chose not to defend his title.
Alex Michelsen won the title after defeating Denis Kudla 7–5, 4–6, 6–2 in the final.

## Seeds

* Michael Mmoh (first round)
* Aleksandar Kovacevic (first round)
* Alex Michelsen (champion)
* Zachary Svajda (quarterfinals)
* Emilio Nava (semifinals)
* Titouan Droguet (first round)
* Adam Walton (withdrew)
* Shang Juncheng (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| | Denis Kudla | 5 | 6 | 6 | | | | | |
| 5 | Emilio Nava | 7 | 4 | 1 | | | | | |
| 5 | Emilio Nava | 7 | 4 | 1 | | Denis Kudla | 5 | 6 | 2 |
| | | | | | 3 | Alex Michelsen | 7 | 4 | 6 |
| 3 | Alex Michelsen | 6 | 2 | 6 | 3 | Alex Michelsen | 7 | 4 | 6 |
| | Tennys Sandgren | 2 | 6 | 4 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | M Mmoh | 4 | 3 | | | | | | | | | | | | | | | |
| | M Damm | 6 | 6 | | | M Damm | 6$^4$ | 3 | | | | | | | | | | |
| | D Kudla | 6$^5$ | 6 | 6 | | D Kudla | 7$^7$ | 6 | | | | | | | | | | |
| | P Kypson | 7$^7$ | 3 | 4 | | | | | | | D Kudla | 6 | 7$^7$ | | | | | |
| Q | T-S Kwiatkowski | 6$^5$ | 6 | 6 | | | | | | | A McHugh | 3 | 6$^5$ | | | | | |
| WC | S Kirchheimer | 7$^7$ | 2 | 4 | Q | T-S Kwiatkowski | 6 | 4 | 3 | | | | | | | | | |
| | A McHugh | 3 | 7 | 6 | | A McHugh | 0 | 6 | 6 | | | | | | | | | |
| LL | A Cozbinov | 6 | 5 | 3 | | | | | | | | | | | D Kudla | 5 | 6 | 6 |
| 4 | Z Svajda | 6 | 6 | | | | | | | | | | | 5 | Em Nava | 7 | 4 | 1 |
| SE | A Mayo | 3 | 4 | | 4 | Z Svajda | 6 | 7 | | | | | | | | | | |
| Q | S Fanselow | 6 | 6 | | Q | S Fanselow | 2 | 5 | | | | | | | | | | |
| Q | C Kingsley | 4 | 2 | | | | | | | 4 | Z Svajda | 4 | 4 | | | | | |
| LL | C Harrison | 1 | 4 | | | | | | | 5 | Em Nava | 6 | 6 | | | | | |
| Q | M Cassone | 6 | 6 | | Q | M Cassone | 4 | 4 | | | | | | | | | | |
| | N Serdarušić | 4 | 4 | | 5 | Em Nava | 6 | 6 | | | | | | | | | | |
| 5 | Em Nava | 6 | 6 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | T Droguet | 4 | 1 | | | | | | | | | | | | | | | |
| | B Zhukayev | 6 | 6 | | | B Zhukayev | 4 | 2 | | | | | | | | | | |
| Q | M Rosenkranz | 6 | 2 | 5 | WC | N Basavareddy | 6 | 6 | | | | | | | | | | |
| WC | N Basavareddy | 4 | 6 | 7 | | | | | | WC | N Basavareddy | 3 | 3 | | | | | |
| WC | J Monday | 6 | 5 | 3 | | | | | | 3 | A Michelsen | 6 | 6 | | | | | |
| | G Debru | 4 | 7 | 6 | | G Debru | 3 | 6 | 4 | | | | | | | | | |
| | B Tomic | 6 | 6$^5$ | 4 | 3 | A Michelsen | 6 | 3 | 6 | | | | | | | | | |
| 3 | A Michelsen | 4 | 7$^7$ | 6 | | | | | | | | | | 3 | A Michelsen | 6 | 2 | 6 |
| 8 | J Shang | 6 | 6$^9$ | 2 | | | | | | | | | | | T Sandgren | 2 | 6 | 4 |
| | A Ritschard | 3 | 7$^{11}$ | 6 | | A Ritschard | 6 | 6 | | | | | | | | | | |
| Q | E Karlovskiy | 5 | 2 | | | M Krueger | 2 | 4 | | | | | | | | | | |
| | M Krueger | 7 | 6 | | | | | | | | A Ritschard | 6$^9$ | 4 | | | | | |
| | T Sandgren | 4 | 7$^8$ | 7$^7$ | | | | | | | T Sandgren | 7$^{11}$ | 6 | | | | | |
| | E Quinn | 6 | 6$^6$ | 6$^3$ | | T Sandgren | 6 | 7 | | | | | | | | | | |
| | B Holt | 6 | 3 | 7$^7$ | | B Holt | 3 | 5 | | | | | | | | | | |
| 2 | A Kovacevic | 4 | 6 | 6$^1$ | | | | | | | | | | | | | | |